[1099] Critical CSS handling behavior differs in `nuxt generate`

First off, I really really appreciate all of the work you forks have done. I'm using nuxt for my personal website and the overall dev experience it provides is simply awesome. Serving it w/ gh-pages and it just works!

Anyway, I'm having this small trouble that, unlike in dev environment, critical CSS is not handled correctly (as desired?) when I serve static files generated by nuxt generate.

For instance, I have white-space: pre-line property for some element on the first page. This rule is loaded before the first render and don't trigger any layout re-render when served in nuxt start (which is pretty neat). However, re-layout occurs from the statically generated site (see my site for instance).

It kinda makes me sad, so I have a few questions:

1. Am I doing something wrong? I haven't done anything special but maybe it requires additional jobs to achieve same effect in nuxt generate?
2. If it's not my mistake, is this behavior (cannot handle critical css correctly in nuxt generate) inevitable?
3. If it isn't, how can I help fixing this? I'm willing to contribute to solve this issue (if it is actually an issue), and little hint might help a lot for me to get started.

Thanks in advance for reading, you folks are amazing 😄